rdblue commented on a change in pull request #24798: [SPARK-27724][SQL] 
Implement REPLACE TABLE and REPLACE TABLE AS SELECT with V2
URL: https://github.com/apache/spark/pull/24798#discussion_r291409729
 
 

 ##########
 File path: 
sql/core/src/test/scala/org/apache/spark/sql/sources/v2/DataSourceV2SQLSuite.scala
 ##########
 @@ -170,6 +173,85 @@ class DataSourceV2SQLSuite extends QueryTest with 
SharedSQLContext with BeforeAn
     checkAnswer(spark.internalCreateDataFrame(rdd, table.schema), 
spark.table("source"))
   }
 
+  test("ReplaceTableAsSelect: basic v2 implementation using atomic catalog.") {
+    spark.sql("CREATE TABLE testcatatomic.table_name USING foo AS SELECT id, 
data FROM source")
+    val testCatalog = spark.catalog("testcatatomic").asTableCatalog
+    val originalTable = testCatalog.loadTable(Identifier.of(Array(), 
"table_name"))
+    spark.sql("REPLACE TABLE testcatatomic.table_name USING foo AS SELECT id 
FROM source")
+    val replacedTable = testCatalog.loadTable(Identifier.of(Array(), 
"table_name"))
+    assert(replacedTable != originalTable, "Table should have been replaced.")
+    assert(replacedTable.name == "testcatatomic.table_name")
+    assert(replacedTable.partitioning.isEmpty)
+    assert(replacedTable.properties == Map("provider" -> "foo").asJava)
+    assert(replacedTable.schema == new StructType()
+      .add("id", LongType, nullable = false))
+    val rdd = 
spark.sparkContext.parallelize(replacedTable.asInstanceOf[InMemoryTable].rows)
+    checkAnswer(
+        spark.internalCreateDataFrame(rdd, replacedTable.schema),
+        spark.table("source").select("id"))
+  }
 
 Review comment:
   All of the success cases should be applied to both atomic and non-atomic 
catalogs because we expect a difference in behavior only in failure cases.

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